2001 GT mods....Do i have to tune?

Im putting a C&L plenum, BBK 75mm throttle body, C&L inlet pipe and a C&L 80mm mass air into a buddies car...

I told him he SHOULD tune it...im allmost positve if you change the MASS you need to retune...

But i cant for the life of me get him to understand that it would probably be a better HP increase to tune it...even if he DOSENT use the 80mm mass air..

I dont even think the mass is needed.. i mean will the 80mm mass even make more power if all he is putting on the car is a plenum, cold air, and a throttle body


I think he should just put the plenum, cold air, and a throttle body on and tune it

Or would it be a waste to tune it with those mods...if im right im pretty sure its commen sense to tune it for those mods...ESPECIALLY with the 80mm mass


WTF do i do here i dont know mod motors like i know a windsor

Well thats what ive tried telling him...

And "someones" convinced him that long tube headers wont net him much horsepower over stock manifolds....WTF is this true?

By the way the car is 100% stock...

His only PLANNED exhaust mods were an O/R H pipe and flows...and when i told him he wshould get headers he "assured me" he wouldent get much of a gain from them...but i think otherwise lol